dma_sio_rcv.c

瑞萨CAN通讯单片机程序

/*  FILE COMMENT   ****************************************************
 *	M32R C Programming		Rev. 1.00
 *		 < Sample Program for Serial I/O (UART) DMAC Receive >
 *
 *	Copyright (c) 2003 Renesas Technology Corporation
 *			   And Renesas Solutions Corporation
 *			   All Rights Reserved
 **********************************************************************/
/************************************************************************/
/*		Include file						*/
/************************************************************************/

#include		"..\inc\sfr32170_pragma.h"

/************************************************************************/
/*		Definition of external reference			*/
/************************************************************************/

extern	void		DisInt( void );				/* Interrupt disable function */
extern	void		EnInt( void );				/* Interrupt enable function */

/************************************************************************/
/*		Function prototype declaration				*/
/************************************************************************/

	void		main(void);				/* Main function */
	void		init_func(void);			/* Initial setup function */
	void		port_init(void);			/* Initialize port */
	void		dma_init(void);				/* Initialize DMA */
	void		sio0rcv_init( void);			/* Initial setup serial I/O */

/************************************************************************/
/*		Define macro						*/
/************************************************************************/

/* Setting serial IO */

						/* 0123 4567	*/
#define	P8MOD_SCI0	(unsigned char)0x30	/* 0011 0000B	P8 operation mode register	*/
						/* |||| |||+---	P87			*/
						/* |||| ||+----	P86			*/
						/* |||| |+-----	P85			*/
						/* |||| +------	P84			*/
						/* |||+--------	RXD0			*/
						/* ||+---------	TXD0			*/
						/* ++----------	don't care		*/

						/* 0123 4567	*/
#define	SnTCNT_INI	(unsigned char)0x00	/* 0000 0000B	SIOn transmit control register	*/
						/* |||| |||+---	Disable transmission		*/
						/* |||| +++----	don't care		*/
						/* ||++--------	f(BCLK)			*/
						/* ++----------	don't care		*/

						/* 0123 4567	*/
#define	SnMOD_INI	(unsigned char)0x20	/* 0010 0000B	SIOn mode register	*/
						/* |||| |||+--- Sleep function disabled	*/
						/* |||| ||+---- Parity inhibited	*/
						/* |||| |+----- don't care(odd)		*/
						/* |||| +------ 1 stop bit		*/
						/* |||+-------- Internal clock		*/
						/* +++--------- 8-bit UART		*/

/* Setting baud rate (Be sure to check actually set value when using) */

#define	XIN		10			/* 10MHz */
#define	BAUD_19200	(unsigned char)(XIN * 2000000 / 16 / 19200 - 1)	/* 19200bps */

/* DMAC setting data */

						/* 0123 4567	*/
#define	DMA4_INIT	(unsigned char)0x2d	/* 0010 1101B	DMA4 channel control register		*/
						/* |||| |||+---	Destination address incremented		*/
						/* |||| ||+----	Source address fixed			*/
						/* |||| |+-----	Transfer size of 8-bit			*/
						/* |||| +------	Transfer enabled			*/
						/* ||++--------	10: Start upon completion of serial I/O 0 reception */
						/* |+----------	No transfer request			*/
						/* +-----------	Normal mode				*/

/************************************************************************/
/*		Global variable					*/
/************************************************************************/

	unsigned char	RcvBuf0[256];				/* Receive buffer */

/*""FUNC COMMENT""*******************************************************
 * Function name : init_func()
 *-----------------------------------------------------------------------
 * Description	: Initialize ICU
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	:
 *""FUNC COMMENT END""***************************************************/
void init_func(void)
{
	port_init();						/* Initialize those related to port 	*/
	dma_init();						/* Initialize DMA  			*/
	sio0rcv_init();						/* Initial setup serial I/O 		*/
}

/*""FUNC COMMENT""*******************************************************
 * Function name :port_init()
 *-----------------------------------------------------------------------
 * Description	:Initialize port
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	:
 *""FUNC COMMENT END""***************************************************/
void port_init(void)
{
	PIEN = PIEN0;						/* Enable port input */

/*** LED output port ***/

	P11DATA = 0x00;						/* Output data (must be set prior to mode) */
	P11DIR = 0xff; 						/* P110-P117 : Output mode */
	P11MOD = 0x00; 						/* P110-P117 : Input/output port */
}

/*""FUNC COMMENT""*******************************************************
 * Function name : dma_init()
 *-----------------------------------------------------------------------
 * Description	: - Initialize DMAC
 *		:   DMA4: Transfer received data of the SIO0 receive 
 *		:   buffer to the internal RAM
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: Restart is required if the transfers size is 256 bytes or more
 *""FUNC COMMENT END""***************************************************/
void dma_init(void)
{
/*** DMA4 initial setting ***/

	DM04ITST = ~DMITST4;					/* Clear DMA4 interrupt request */
	DM04ITMK |= DMITMK4;					/* Inhibit DMA4 interrupt */

	DM4SA = (unsigned short)&S0RXB_L;			/* Source address -> SIO0 receive buffer */
	DM4DA = (unsigned short)&RcvBuf0;			/* Destination address -> RAM buffer */

	DM4TCT = 0xff;						/* Number of DMA4 transfer (256 times) */
	DM4CNT = DMA4_INIT;					/* Start upon the completion of the serial I/O0 reception, enable transfer */
}

/*""FUNC COMMENT""*******************************************************
 * Function name : sio0rcv_init()
 *-----------------------------------------------------------------------
 * Description	: Set 8-bit UART reception for SIO0
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: Port input function must be enabled
 *		: No transmission setting has done
 *		: For M32R/E#1,2,3, PnMOD cannot be accessed for R/M/W
 *		: The function must be executed while interrupt is inhibited
 *""FUNC COMMENT END""***************************************************/
void	sio0rcv_init( void)
{
/*** Setting transfer mode */

	S0RCNT = 0x00;						/* Disable reception */
	S0TCNT = SnTCNT_INI;					/* f(BCLK) and disable transmission */
	P8MOD |= P8MOD_SCI0;					/* Set P8 for SCIO mode */
	S0MOD = SnMOD_INI;					/* Set data format */
	S0BAUR = BAUD_19200;					/* Set baud rate */

/*** interrupt related settings ***/

	ISIO0RXCR = (unsigned char)7;				/* Set SIO0 receive interrupt priority level */
	SI03SEL &= ~ISR0;					/* Select receive-finished interrupt */
	SI03MASK &= ~R0MASK;					/* Enable SIO0 receive interrupt request */

/*** Starting reception ***/

	S0RCNT |= REN;						/* Enable reception */
}

/*""FUNC COMMENT""*******************************************************
 * Function name : main()
 *-----------------------------------------------------------------------
 * Description	: Serial receive data is stored in RAM by DMA transfer
 *		: - Start DMA4 upon reception of serial I/O0
 *		: - Receive data is stored in buffer by DMA
 *		: - Output DMA4's transfer counter 
 *		:   (number of receive bytes) to LED (PORT11)
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: Interrupt is not actually used 
 *		: LED display is (255-number of receive bytes)
 *""FUNC COMMENT END""***************************************************/
void main(void)
{
/*** Initialize microcomputer ***/

	DisInt();						/* Disable interrupt */

	init_func();

	EnInt();						/* Enable interrupt */

	while(1) {
		P11DATA = DM4TCT;
	}
}